Showers and thunderstorms developed in a warm, moist, and unstable air mass. Some of these storms produced damaging wind gusts and hail.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS JAN wrote it up.
Showers and thunderstorms developed in a warm, moist, and unstable air mass. Some of these storms produced damaging wind gusts and hail.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Jackson, MS wrote its last area forecast discussion before the first event at May 22, 1:51 PM CST, 16 minutes earlier.
Area Forecast Discussion National Weather Service Jackson MS 251 PM CDT Tue May 22 2018 .DISCUSSION... Tonight through Wednesday: The primary focus will be for a summer like pattern with diurnal convection through the period. Afternoon convection, which started in an area of differential heating, will start to diminish once we begin to lose the heat of the day for this evening. Models continue to indicate light flow through the atmospheric column with pwats above 1.5 inches along with instability. This will translate to slow moving storms with locally heavy rainfall with ponding of roadways. Expect the convection to gradually diminish this evening. For Wednesday convection will build in coverage as we go into the heat of the day. Any storms that do develop will build over areas where outflow boundaries were left by todays storms or possibly such as this afternoon over differential heating areas. An upper low near the SE Texas and SW Louisiana border section will act as a focus for convection on Wednesday. Like this afternoon this will be pulse type storms,which will become outflow dominant. Expecting scattered coverage during the afternoon. Not seeing any signs of any organized development, so will keep the HWO clear for now. Lows for tonight will be in the middle 60s to the lower 70s. Highs for Wednesday will be from the middle 80s to the lower 90s./17/ Wednesday night through Monday: Models in agreement that weak mid level broad trough will remain entrenched over the Lower Mississippi River Valley and Gulf of Mexico through the weekend. While differences do exist in the strength and positioning of model low level features, the models do agree that PWs will steadily increase through the period which will promote increasing chances of mostly diurnal convection. Given PW values around 2 inches and weak flow aloft, locally heavy rainfall will be good possibility where the deepest convection sets up. Presently, the southeastern portions look to receive the heaviest rainfall, however, it will continue to be hard to pin that down accurately until the models can come into better agreement on the low level features./26/ && .AVIATION... 18Z TAF discussion: As expected, VFR categories are being observed at sites across the region early this afternoon. With scattered convection once again expected to slowly move across the ArkLaMiss from early afternoon through early this evening, a brief bout of MVFR/IFR ceilings and/or visibilities will again be possible if observed on-station. This activity will dissipate during the evening hours. Winds will be light northerly. As we push into 10z expect some areas of ifr/mvfr ceilings which will lift by 15z./17/ && .PRELIMINARY POINT TEMPS/POPS... Jackson 69 89 69 87 / 21 47 29 44 Meridian 67 89 69 87 / 22 48 32 56 Vicksburg 69 90 71 89 / 19 49 26 41 Hattiesburg 67 89 68 87 / 20 53 34 73 Natchez 68 89 70 88 / 19 53 27 56 Greenville 70 89 71 88 / 20 42 20 30 Greenwood 69 89 70 89 / 20 33 23 28 && .JAN WATCHES/WARNINGS/ADVISORIES... MS...None. LA...None. AR...None. &&
Hazardous Weather Outlook National Weather Service Jackson MS 230 PM CDT Tue May 22 2018 ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025>066-072>074- 231930- Ashley-Chicot-Morehouse-West Carroll-East Carroll-Richland- Madison LA-Franklin LA-Catahoula-Tensas-Concordia-Bolivar- Sunflower-Leflore-Grenada-Carroll-Montgomery-Webster-Clay-Lowndes- Choctaw-Oktibbeha-Washington-Humphreys-Holmes-Attala-Winston- Noxubee-Issaquena-Sharkey-Yazoo-Madison MS-Leake-Neshoba-Kemper- Warren-Hinds-Rankin-Scott-Newton-Lauderdale-Claiborne-Copiah- Simpson-Smith-Jasper-Clarke-Jefferson-Adams-Franklin MS-Lincoln- Lawrence-Jefferson Davis-Covington-Jones-Marion-Lamar-Forrest- 230 PM CDT Tue May 22 2018 This hazardous weather outlook is for portions of southeast Arkansas, northeast Louisiana, central Mississippi, north central Mississippi, and south central Mississippi. .DAY ONE...Tonight and Wednesday The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday night through Monday The probability for widespread hazardous weather is low. .SPOTTER CALL TO ACTION STATEMENT... The activation of storm spotters, HAM radio operators, and emergency management personnel in support of severe weather operations is not expected through next Monday. 21 && ...HAZARD LEGEND... No short term hazards expected. ...USEFUL WEATHER WEB PAGES (URLS)... NWS JAN Home page... https://www.weather.gov/jan Stay Aware, Stay Safe NWS JAN Briefing Page... https://www.weather.gov/jan/safe Latest Weather Briefing... https://www.weather.gov/jan/weather_briefing Find NWS JAN on Facebook... https://www.facebook.com/NWSJacksonMS Follow NWS JAN on Twitter... @NWSJacksonMS Follow NWS JAN on Youtube... https://www.youtube.com/user/NWSJacksonMiss
The Jackson/Brandon,MS radar (KDGX), 146 km away, was scanning. The volume nearest the first event began at 20:07 UTC.
1 thunderstorm wind, 1 hail. Local standard time, as filed.
Numerous trees were blown down with some on homes.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2018Every state in 2018This day in weather historyWarnings in Louisiana, May 2018
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 746722, 746721.